Routines
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58156: Pause Game
Used by the routine at StartGame.
Pauses the game if CAPS SHIFT or SPACE is pressed on its own. The game continues when the key has been pressed again.
Return unless CAPS SHIFT or SPACE is pressed on its own.
PauseGame 58156 LD A,126 Read from the keyboard;
Port Number Bit
0 1 2 3 4
126 SHIFT / SPACE Z / SYM X / M C / N V / B
58158 CALL ReadKeyboardPort
58161 BIT 0,A Return if neither of the keys CAPS SHIFT or SPACE is pressed.
58163 RET Z
Return if any of the other keys is pressed too.
58164 AND %00011110 Keep bits 1 to 4.
58166 RET NZ Return if any of them is set.
Wait for the key to be let go of, then pressed and let go of again.
PauseGame_Release 58167 LD A,126 Read the keys.
58169 CALL ReadKeyboardPort
58172 BIT 0,A Jump to PauseGame_Release if bit 0 is set.
58174 JR NZ,PauseGame_Release
Wait for a key to be pressed.
PauseGame_Press 58176 LD A,126 Read the keys.
58178 CALL ReadKeyboardPort
58181 BIT 0,A Jump to PauseGame_Press if bit 0 is not set.
58183 JR Z,PauseGame_Press
Wait for the key to be released.
PauseGame_ReleaseAgain 58185 LD A,126 Read the keys.
58187 CALL ReadKeyboardPort
58190 BIT 0,A Jump to PauseGame_ReleaseAgain if bit 0 is set.
58192 JR NZ,PauseGame_ReleaseAgain
58194 RET Return.
View the equivalent code in;
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